It's a Zwinky ad, served from TribalFusion. If you have a TribalFusion account then you can go to the site profile and change it to block popups/popunders.

I no longer work with Tribal Fusion - it seems NetShelter is working with them, so now that I know what campaign is was, I can ask NetShelter to ensure pop-ups are blocked. They informed me that pop-ups are supposed to be blocked - along with pop-unders, etc. - but it looks like this one slipped through. Thanks for the detail so I can try to stop this.